exports.formatFileSize = size => {
  let value = Number(size);
  if (size && !isNaN(value)) {
    const units = ["B", "KB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB", "BB"];
    let index = 0;
    let k = value;
    if (value >= 1024) {
      while (k > 1024) {
        k = k / 1024;
        index++;
      }
    }
    return `${k.toFixed(2)}${units[index]}`;
  }
  return "-";
};
